 Here \( w_1 \in [0,1]\)  and \( w_i =0\)  for \(i = 2,\dots ,D\) . The function was tested for \(D=10\)  with 5 categories each. We note that to evaluate the performance of MixMOBO, we compared it against the NSGA-II variant [1]} that can deal with mixed variables (by running \(ZDT4\)  in a mixed variable setting and \(ZDT6\)  with categorical variables). No encryption is necessary for GAs. GAs required, on average, \(10^2\)  more function calls compared to MixMOBO.
